Bolt anchor



J. KENNEDY.

BOLT ANCHOR.

APPLICATION FILED APR. 3, 1920.

1,410,260. Patented Mar. 21, 1922.

Jalsgvk fffizizmfy @331 Ms Skim/44mg ounce STATES PATENT came.

JOSEPH KENNEDY, OF NEW YORK, N. Y.,

ASSIGNOR TO JOHN nnwnien oenniv; on

MOUNTAINVILLE, NEW YORK.

BOLT ANCHOR.

Specification of Letters Patent; Patented Mai; 21', 1922.

Original application filed March 29, 1919, Serial No. 286,126 Divided and this: application filed Apri1 3, 1920. Serial 1510.370353:

To all. 107mm it may concern:

Be it known that l, Josnrrr KENNEDY, a citizen of the United States of America, and a resident of New York City, county and State or" New York,have invented certain new and useful Improvements in Bolt Anchors, oi which the following is specification, reference being had to the accompanying drawings, lormin a part thereof.

lvly invention relates to improvements in bolt anchors which are designed to be used for bolt anchorages and'to a new and usetul method of manufacturing such shields. More specifically, it relates to expansion shields which are made oi sheet metal and to a method of making such shieldsof sheet metal.

The object of this invention is to provide a simple and inexpensive device which ma be etlectively used to hold a bolt or screw in material such as brick, stone or cement with which the threaded device cannot obtain directly a secure hold. v

Another object is to provide a simple and inexpensive method of making such expansion shields.

In order that my invention may be tllOlOl'lQlllY understood I will now proceed to (ltlSQl'llJl? the same in the following specification, and will then point out the novel features thereof in appenr, ed claims.

This application a division oi: application. Serial No. 286,126., filed by me l /larch 29, L919.

eterringr to the drawings:

Figure 1 is a plan view of: an undivided blank of sheet metal of general arcuate form which may be bent into a shield which embodies this invention.

l iggurc 2 is an end view showing the blank of Fig. 1, atter it has received its first bendinpg.

Figure 3 is a side elevation of an expan sion shield made by folding together a blank oi? the preceding figures. V

Figure .1- is a top plan view of this shield.

Figure 5 is a bottom plan view of the same shield.

l iojure 6 is an elevation of the shield shown in Fig. 3. taken at right angles to the view in the latter figure.

Figure '7 is an elevation ot the same-device showing the'opposite side to that shown Like characters-of reference designatecorresponding parts in all the figures ofthe d rawmgs.

designates a blank of sheet metal of general arcuate form although its upper sides 61 are cut to flare outwardly slightly to the upper edge. Between these edges and the restiot the edges which flare outwardly in the other direction are indentations or notches 62,

the indentations 62. 64 is a slot cut vertically in this blank but terminating at 65 short of the lower edge of the blanln From one of the upper edges 61 isa triangular projection 66 opposite which in the other edge 61 is an indentation 67 of less angularity than that of the projection 66. The dotted lines. 68-68 designate portions of this blank which are to be pinched'toether to form short outwardly projecting ribs 70 in the finished shield. The lines 69 designate portions of the blank which are to be stamped into corrugations which in the finished shield are designated by 71.

The first step towards forming; a shield from such ablank atterxit has been corrugated is illustrated in Fig. 2' which shows portions of the blank bent into transverse curves 72 with an intermediate curved portion 73 connectedwith the parts 72 along lines at 74. The outer edges of the blank are also'bent to form curved portions 75-75 joined to the portions 72 along lines at 76.

The shieldisthen finished by folding the blank thus formed around a central axis as sliownin Figs. 37. The upper end ol the shield thus formed will be substantially circular as shown at 7 7 in Fig. t with the short ribs 70 projecting outwardly therefrom. This upper portionof the shield, however, will flare outwardly towards the upper end of the shield, and this formiis provided for the purpose of closely: fitting the outer end and in the center of the blank 1s a perforation 63 in arcuate ahnernent with portions 7 in size towards'thelower end of the shield of the hole in which the shield is to be used and of facilitating the insertion of a bolt or screw. The parts 74 and 76, however, are so arranged that when the shield is com pleted they will converge towards the lower end of the shield to make the interior thereof similar in cross sectional form to an hourglass, that is, these parts will converge to restrict the bore of the shield in one of its transverse dimensions. The outer portion of the shield will be cylindrical substantially throughout its length and of a diameter corresponding approximately with that of the hole in which the device is to be used. The part of the shield which is formed of the portion 73 will increase in cross sectional dimension towards the lower end of the shield and sowill the opposite part of the shield which is formed or": the parts l'5-7 The slot 64 when used will divide the part of the shield formed by the portion 73 throughout the greater part of the length 01' the shield and the oppositepart formed by theportions 7 5 will be divided throughout the length of'the shield. i

' When the blank is folded together to form the tubular shield the projection 66 will reg isterwith the indentation 67' as shown in Fig. 6, and will serve to hold the edges of the shield in alinement in such a manner as to maintain the corrugations 71 in helical alinement. These corrugations are provided for the purpose of forming the inner bore of the shield with internal screw threads with which the threads of a bolt or screw may engage: It may be seen that the shield thus tormed'has a central chamber which diminishes from a cylindrical form at the upper end (Fig. i) to that of an hourglass torm (Fig. 5) at the lower en When a bolt is inserted this part of the shield will be spread apartby the bolt. The transverse.

dimension of the restricted part of the bore of this device is, however, substantially the same as that of the internal periphery of the shield at its upper end, so that when the bolt is inserted the metal of the shield will substantially surround the threads of the bolt without interruption throughout the length of the shield. The completed shield has two longitudinal chambers formed .within the parts made by the portion 73 and the 75. These chambers increase so that they provide an excess of metal which when the bolt is inserted, will be crowded between the bolt and the wall of the hole in which the shield is inserted to thus form a secure anchorage.

It is not necessary that the constriction of the bore of the device be made in hourglass form. For example, in Fig. 8 the lnner endof a shield is shown with the inwardly projecting portions 78 and the abutting edges T9 syn'imetrically disposed.

tubes having an excess of metal near the.

inner ends thereof. It is only necessary that this taper be formed at some time before the bolt is to be inserted, and this taper may be formed by driving the shield into a cylindrical hole prepared for it, which act will contract the inner end of the shield, it it has not been constructed previously with the tapered bore.

l'l hat I claim is:

1. [in expansion shield blank of sheet metal with a part of the sides thereof near one end approximately parallel, the rest of the sides of said blank flaring therefrom, said blank being arranged to be folded transversely into a tube, the circumference of which approximates the distance between said parallel parts and the flaring portion arranged to be bent to provide excess metal in other parts of the tube, said blank being constructed with an angular indentation on one oi. said first-mentioned parts of its sides and having an angular cooperating projection on the opposite side, arranged to prevent the longitudinal displacement of these sides when broug it together to form the tube.

2. An expansion shield blank of sheet metal, with a part of the sides thereof near one end approximately parallel, the rest oi the sides oi said blank flaring therefrom and having transverse corrugations therein, said blank being arranged to be folded transversely into a tube, the circumference of which approximates the distance between .11! in other parts of the tube and to'cause said corrugations to lie a helix, said blank being constructed with an angular indentation on one or said first-mentioned parts of its sides and having an angular cooperating projection on the opposite side, arranged to prevent the longitudinal displacement oi. these sides when brought together to form the tube and to maintain the corrugations in their helical position.

An expansion shield blank of sheet metal. with a part of the sides thereoi. near one end flaring sl gzhtly toward said end, the rest of the sides of said blank flaring toward the other end, transverse corrugations in the blank between said latter parts of its sides.

said. blank being arranged to be folded transnged to be bent to provide excess metal other parts of the tube, and to cause said corrugations to lie in a helix, said blank being constructed with an angular indentation on one of said first mentioned parts of its sides and having an angular cooperating projec tion on the opposite side, arranged to prevent the longitudinal displacement of these sides when brought together to form the tube and to maintain the corrugations in their helical position.

4. An expansion shield blank of sheet metal, with a part of the sides thereof near one end approximately parallel the rest of the sides of said blank flaring therefrom and having transverse corrugations therein, said blank being arranged to be folded transversely into a tube, the circumference of which approximates the distance between saidparallel parts and the flaring portion arranged to be bent to provide excess metal in other parts of the tube and tocause said corrugationsto lie in a helix, said blank being constructed with an angular indentation on one of said first-mentioned parts of its sides and having an angular cooperating projec tion on the opposite side, arranged to prevent the longitudinal displacement .of these sides when brought together to form the tube and to maintain the corrugations in their helical position, the angularity of the indentation being lesstthan that of the project-ion.

5. An expansion shield blank of, sheet metal with a part of the sides thereof near one end flaring slightly toward said end, the rest of the sides of said blank flaring toward the other end, transverse corrugations in the blank between said latter parts of its sides and intelmediate the central part and the edges of the blank, said blank being arranged to be folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts increasingly depressed to form a bore tapered in one of its transverse dimensions with, the central part of the blank folded over one of said depressions and with the edges of the blank folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, increasing in amount as said depressions increase.

6. An expansion shield blank of sheet.

metal with a part of the sides thereof near 1 one end flaring slightly toward said end, with lying substantially in the same cylinder, with opposite parts increasingly depressed to form a bore tapered in one of its transverse dimensions with the central part of the blank folded over one of said depressions and with the edges of the blank folded over the other of said depressions to pro vide an excess of metal over the tapered part of the bore, increasing in amount as said depressions increase.

7. An expansion shield blank of sheet metal with a part of the sides thereof, near one end flaring slightly toward said end, with parts of the metal between them pinched together to form tapered outwardly projectmg ribs, the rest of the sides of said blank flaring toward the other end, transverse cor-,

rugations in the blank between said latter parts of its sides and intermediate the central part and the edges of the blank, said blank being arranged to be folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts in creasingly depressed to form a bore varying from a circular cross-section to one of hour glass form, with the central part of the blank folded over one of said depressions and with the edges of the blank folded over the other of said depressions to provide an excess of metal over the taperedpart of the bore, increasing in amount as said depressions increase.

8. An expansion shield blank of sheet metal with a part of the sides thereof near oneend flaring slightly toward said enchwith parts of the metal between them pinched together to form outwardly projecting ribs, the rest of the sides of said blank flaring toward the other end, transverse corrugations in the blank between said latter part of its sides and intermediate the central part and a the edges of the blank, said blank being arranged to be folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder,

with opposite part-s increasingly, depressed.

to form a bore tapered in one of its transverse dnnensions with the central part of the blank folded over one ofsaid depressions.

and with the edges of the blank folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, increasing in amount as said depressions increase, and to cause said corrugations to lie in a helix in the bore'of said tube, said blank being constructed with an angular indentation on one of said first mentioned parts of its sides and having an angular cooperating projection on the opposite side, arranged to prevent the longitudinal displacement of these sides when brought together to form thetube and to maintain the corrugations in their helical position.

' together to form tapered outwardly projecting ribs, the rest of the sides of said blank" flarlng toward the other end,

transverse corrugations 1n the blank between said latter parts of its sides and interi'ncdiate the can tral part and the edges of the blank, said blank being arranged to be folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts in ores-singly depressed to form a bore varying from circular cross-section to one of hourglass form, with the central part of the blank folded over one of said depressions and with the edges of theblank folded over the other of said depressions to provide an excess of metal overthe tapered part of the bore, increasing in amount as said depressions increase, and to cause said corrugations to lie in a helix in the bore of said tube, said blank being constructed with. an angular indentation on one of said first mentioned parts of its sides and having an angular cooperating projection on the opposite side, arranged to prevent the longitudinal displacementof these sides when broughttm gether to form the tube and to maintain the corrugations in their helical position, the

Jhan

angularity of the iiulentation being less 1 that of the projections. i r l 10%. An expansion shield blank of sheet metal with a part of the sides thereof near one end flaring slightly toward said 'end, with parts of the metal between them pinched together to form tapered outwardly projecting ribs, the rest of the sides of said blank flaring toward the other end, transverse corrugations in the blank between said latter parts of its sides and interi'i'iediate the central part and the edges of the blank, said blank being arranged to be folded trans versely into a tube with the outer portions of greater diameter lying substantially in the same cylinder, with opposite parts increas ingly depressed to form a bore varying from a circular cross-section to one of hour-glass form, with the central part of the blank folded over one of said depressions and with the edges of the blank folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, in-

creasing in amount as said depressions increase, and to cause sald corrugations to 116- in a helix: in the bore of said tube, said blank being constructed with an angular indentation on one of said first mentioned parts of its sides and having an angular cooperating projection on the opposite side arranged to prevent the longitudinal displacement of these sides when brought together to form the tube and to maintain the corrushield blanktof sheet "bore;

the tube of constricted bore.

gations in their helical position, the angularity of the indentation being less than that of the projection, said central part of the blank being cut away to form a longitudinal slot.

11. An expansion shield of sheet metal folded transversely into a tube having edges of the metal extending from one end to the other thereof with the outer portions of said tially in the same cylinder, with opposite -parts depressed toconstrictthebore of the tube and with parts adjacentsaid depressions bent to -provide an excess of metal at the part of the tube of constricted bore. 7

13. An expansion shield of sheet metal having more metal at one end than at the other, folded transversely into a tube having edges of the metal extending from one end to the other thereof with the outer portions of said shield of greatest diameter lying substantially in the-same 1 cylinder, with opposite parts depressed to constrict the bore of the tube and with parts adjacent said depressions bent to provide an excess of metal at the part of thetube of constricted 14. An expansion shield of sheet metal having more metal at one end than at the other, folded transversely into a tube having edges of the metal extending from one end to the other thereof with the outer portions of said shield of greatest diameter lyin g substantially in the same cylinder, with opposite tube in one of its transverse dimensions and with parts ad acent said depressions bent to provide an excess of metal at the 15. An expansion shield of sheet metal having inore metal at one end than at the other, folded transversely into a tube having edges of the metal extending from one end to the other thereof with the outer portions of said shield of greatest diameter lyin sub stanially in the same cylinder, with opposite parts increasingly depressed to form a bore tapered in one of its transverse dimensions, and with parts adjacent said depressions bent to provide an excess of'metal increasing in amount as said depressions increase.

16. An expansion shield of sheet metal havinglmore metal at one end than at the part of parts depressed to constrict the bore of the other, folded transversely into a tubewith 1 the outer portions of greatest diameter lymg substantially in the same cylinder, with opposite parts increasingly depressed to form a bore tapered in one of its transverse '(llIIlQIlSlOllS with the lillil'ill part of the metal folded over one of said depressions and with I :the edges of the metal folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, said.

excess of metal increaslnn in amount as said depressions increase in depth.

17. An expansion slnold or sheet metal having more metal at one end than at the other, folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts increasingly depressed to form a bore tapered in one of its transverse dimensions with the central part ofthe blank folded over one of said depressions and with the edges of the metal folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, said excess of metal increasing in amount as said depressions increase in depth, said central part of the metal being cut away to form a longitudinal slot.

18. An expansion shield of sheet metal having more metal at one end than at the other, folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts increasingly depressed to form aflbore varying from a circular cross-section to one of an hour-glass form and with parts adjacent said depressions bent to provide an excess of metal increasing in amount as'said depressions increase in depth.

- 19. An expansion shield of sheet metal having'more metal at one end than at the other, folded transversely into a tube with the outer portions of greatest diameter lying substantially "in the same cylinder. with op" posite parts increasingly depressed. to form a bore varylng from a circular cross-section to one of hour glass form, with the central part of the metal folded over one of said de-' pressions and with the edges of the metal folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, said excess of metal increasing in amount as said depressions increase in depth.

2Q. An expansion shield of sheet metal having more metal at one end than at the other, folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts increasingly depressed to form a bore varying from circular crosssection to one of hour-glass form, with the central part of the metal folded over one of said I depressions and with the edges of the metal folded "over th other ofsaid depressions to IJI'OVlClG an excess of metal over the tapered part of the here, said excess of metal increas in'g i'n amount as said depressions increase in depth, said central part of the blank be ing cut away to form a longitudinal slot.

21. An expansion shield of sheet metal having more metal. at oneend than at the other, foldedtransversely into a tube with t c outer portions of greatest diameter lying stantially in the same cylinder, with opposite parts increasingly depressed to form a bore varying from a circular cross-section to one of an hourglass form and with parts adjacent said depressions bent to form longitudinal chambers flaring as the bore tapers. v

22. An expansion shield of sheet metal having more metal at one end than at the other having transversecorrugations therein, folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts depressed to constrict the bore of the tube and with parts adjacent said depressions bent'to provide an excess of metal at the part of thetube of constricted bore.

23.;311 expansion shield of sheet metal having more metal at one end than at the otheri having transverse corrugations therein, folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opincreasing in amount as said depressions in crease in depth. p

I 24:. An expansion shield of sheet metal having more metal atone end than at the other having transvers corrugations intermediate the central 1 irtand tho edges thereof, folded transversely intoa tube with the outer portions of great-est diameter lying substantially in the same cylinder, with opposite parts increasingly depressed to form a bore tapered in one of its transverse dimensions with the central part of the metal folded. over one of said depressions a'ndwith the'edges of the metal folded over the other of said depressions to provide an excess of metal over the tapered part of the bore, said excess of metal increasing in amount as said depressions increase in depth.

25. An expansion shield of sheet metal having more metal at one end. thanat the other having transverse corrugations therein, folded transversely into a tube with the outer portions of greatest diameter lying substantially in the same cylinder, with opposite parts increasingly depressed to form a bore varying from a circular cross-section'to one of hour-glass form with the central part of them'etal folded over one of said depressions and with the edges of thelnetal folded over the other of said depressions to provide an excess of 'metalover 'posite parts increasingly depressed to form a bore tapered in one of llZS'lLI'illlSVfilSQ di- V the tapered part of the bore, said excess of'metal increasing in amount as said depressions increase in depth.

26. The process of making an expansion shield which consists in making a foursided undivided sheet metal blank having one side of a length equal to the length of the shield, one end having a length approximately equal to the circumference of the completed shield and the opposite end having a greater length, and folding the blank transversely into a tube, with the outer portions thereof of greatest diameter lying sub- .cess of metal at the stantially in the same cylinder, depressing opposite parts of the blank to constrict the bore of the tube and folding over parts adjacent said depressions to provide an expartof the tube of constricted bore.

27. The process of making an expansion shield WhICh consists in making a four-' sided undivided sheet metal blank having one side of a length equal. to the length of v the shield, one end having a length approximately equal to the circumference .of the completed shield and the oppositeend hav-' ing a greater length,'and folding the blank transversely into a tube, with the outer portions thereof of greatest diameter lying substantially in the same cylinder, increasingly depressing opposite parts of the blank to form a bore tapered in one" of, its transverse dimensions, folding the central part of the blank overone of said depressions and folding the edges of the blank over theother of said depressions.

28.v The process of making an expansion I shield which consists in making a foursided undivided sheet metal blank having oneside of a length equal to the length of the shield, one end having a length appr0xi- 'mately equal to the circumference of the completed shield and the opposite end having a greater length, and folding the'blank transversely into a tube, with the outer portions thereof of greatest diameter lying substantially in the same cylinder, increasingly sided undivided sheet metal blank the central part of the the blank over the other of said depressions.

The process of making an expansion shield which consists in making a fourhaving one side of a length equal to the length of the shield, one end having a length approxi- .slot, in the central with the outer mately equal, to the. circumference of the completed shield and the opposite end hav- ;1ng a greater length, cutting a longitudinal part of the blank, and" folding the blank transversely into a tube,

diameter lying portions thereof of greatest substantially in the same shield which consists in making a four-sided undivided sheet metal blank having one side of a length equal to the length of the shield, one end having a length approximately equal to the circumference ofthe shield and the opposite end having a greater length, the sides of said blank flaring toward said ends, pinching the metal near the smaller end together to form outwardly.projecting ribs, and folding the blank transversely into a tube. p

31. The processof making an expansion shield which consists in making a four-sided undivided sheet metal blank having one side of a length equal to the length of the shield, one end having a length approximately equal to the circumference of the completed shield and the opposite end having a greater length transversely corrugating said blank, and folding the blank transversely into a tube, with the outer portions thereof of greatest diameter lying substantially in the same cylinder.

32. Theprocess of makingjan expansion shield which consists in making four-sided undivided sheet metal blank having one side of a length equal. to the length of the" shield, one end having a length approximately equal to the circumferenceofthe completed shield and the opposite end having a greater length transversely corrugating said blank, and folding the blank transversely into a tube, with the outer portions thereof of greatest diameter lyingsnbstantially in the same 'cylinder,depressing opposite parts of the blank to constrict the bore of the tube and folding over parts adjacent said depressions to provide an excess of metal at the part of the tube of constricted bore The process of making an expansion shield which consists in makinga four-sided undivided sheetmetal blank havingone side of a length equal tothe length of the" shield, one end having a length approximately equal to the circumference of; the completed shield and the opposite end having a greater length, transversely corrugatiug" the blank intermediate the centralpart and the edges thereof, and folding theblank transversely into a tube, with the outer portions of greatest diameter lying substantially in the same cylinder, increasingly depressing opposite parts of the blank'to form abor'e tapered in one of itstransverse dimensions, folding the central part of the blank over, one of said depressions and foldingthe edges of the blank over the other of said depressions.

' 34. The process of ma-kingan expansion shield which consists in making a tour-sided undivided sheet metal blank having one side 01 a length equal to the length of the shield, one end having a length approximately equal to the circumference of the completed shield and the opposite end having a greater length, transversely corrugating the blank intermediate the central part and the edges thereof, and folding the blank transversely into a tube, with the outer portions thereof of greatest diameter lying substantially in the same cylinder, increasingly depressing opposite parts of the blank to form a bore varying from a circular cross-section to one or hour-glass form, folding the central part of the blank over one of said depressions and folding the edges of the blank over the other of said depressions.

35, The process of making an expansion shield Which consists in making a tour-sided undivided sheet metal blank having one side of a length equal to the length of the shield, one end having a length approximately equal to the circumference of the completed shield and the opposite end having a greater length, cutting a longitudinal slot in the central part of the blank, transversely corrugating the blank intermediate the central part and the edges thereof, and folding the blank transversely into a tube, with the outer portions thereof oi": greatest diameter lying substantially in the same cylinder, increasingly varying from a circular cross-section to one of hour-glass form, folding the central part of the blank over one of said depressions and folding the edges of the blank over the other of said depressions.

36. The process of making an expansion shield which consists in making a four-sided undivided sheet metal blank having one side of a length equal to the length of the shield, one end having a length approximately equal to the circumference of the shield and the opposite end having a greater length, the sides of said blank flaring toward said ends, pinching the metal near the smaller end together to form outwardly projecting ribs, transversely corrugating the blank intermediate the central part and the edges thereof, and folding the blank transversely into a tube.

In Witness whereof, I hereunto set my hand this 31st day of March 1920.

JOSEPH KENNEDY. 

